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Contingencies and Commitments (Guarantees) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2022
USD ($)
Variable Interest Entity, Primary Beneficiary | Aviator Wind Class B Membership  
Guarantees And Other Contingencies [Line Items]  
Ownership percentage 49.00%
Guarantees  
Guarantees And Other Contingencies [Line Items]  
Expiration Date indefinite
Maximum Obligation $ 30
Carrying Amount $ 0
Guarantees | Consumers Energy Company  
Guarantees And Other Contingencies [Line Items]  
Expiration Date indefinite
Maximum Obligation $ 30
Carrying Amount $ 0
Indemnification agreement from sale of membership interests in VIEs  
Guarantees And Other Contingencies [Line Items]  
Expiration Date indefinite
Maximum Obligation $ 342
Carrying Amount $ 0
Indemnity obligations from stock and asset sale agreements  
Guarantees And Other Contingencies [Line Items]  
Expiration Date indefinite
Maximum Obligation $ 226
Carrying Amount $ 4